CouchRest::Pager for paging through views

spec/pager_spec.rb

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+require File.dirname(__FILE__) + '/spec_helper'
+
+describe CouchRest::Pager do
+  before(:all) do
+    @cr = CouchRest.new(COUCHHOST)
+    begin
+      @cr.database(TESTDB).delete!
+    rescue RestClient::Request::RequestFailed
+    end
+    begin
+      @db = @cr.create_db(TESTDB)
+    rescue RestClient::Request::RequestFailed
+    end
+    @pager = CouchRest::Pager.new(@db)
+  end
+  
+  after(:all) do
+    begin
+      @db.delete!
+    rescue RestClient::Request::RequestFailed
+    end
+  end
+  
+  it "should store the db" do
+    @pager.db.should == @db
+  end
+  
+  describe "Pager with a view and docs" do
+    before(:all) do
+      @docs = []
+      100.times do |i|
+        @docs << ({:number => (i % 10)})
+      end
+      @db.bulk_save(@docs)
+      @db.save({
+        '_id' => '_design/magic',
+        'views' => {
+          'number' => {
+            'map' => 'function(doc){emit(doc.number,null)}'
+          }
+        }
+      })
+    end
+    
+    it "should have docs" do
+      @docs.length.should == 100
+      @db.documents['rows'].length.should == 101
+    end
+    
+    it "should have a view" do
+      @db.view('magic/number', :count => 10)['rows'][0]['key'].should == 0
+    end
+    
+    it "should yield once per key" do
+      results = {}
+      @pager.key_reduce('magic/number', 20) do |k,vs|
+        results[k] = vs.length
+      end
+      results[0].should == 10
+      results[3].should == 10
+    end
+    
+    it "with a small step size should yield once per key" do
+      results = {}
+      @pager.key_reduce('magic/number', 7) do |k,vs|
+        results[k] = vs.length
+      end
+      results[0].should == 10
+      results[3].should == 10
+      results[9].should == 10
+    end
+    it "with a large step size should yield once per key" do
+      results = {}
+      @pager.key_reduce('magic/number', 1000) do |k,vs|
+        results[k] = vs.length
+      end
+      results[0].should == 10
+      results[3].should == 10
+      results[9].should == 10
+    end
+    it "with a begin and end should only yield in the range (and leave out the lastkey)" do
+      results = {}
+      @pager.key_reduce('magic/number', 1000, 4, 7) do |k,vs|
+        results[k] = vs.length
+      end
+      results[0].should be_nil
+      results[4].should == 10
+      results[6].should == 10
+      results[7].should be_nil
+      results[8].should be_nil
+      results[9].should be_nil
+    end
+  end
+end

spec/spec_helper.rb

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+require File.dirname(__FILE__) + '/../lib/couchrest'
+
+COUCHHOST = "http://localhost:5985"
+TESTDB = 'couchrest-test'